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26
CHEMICAL ENGINEERING
the engine at or near atmospheric pressure. Some additional boiler capacity will be needed. This large gain is due to the better utilization by the turbine of low pressures. A good vacuum is assumed. The turbine will be particularly
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1,000,000 FIG. 18.—Turbine efficiency curve.
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1,500 r.p.m., 4 stage, 170 Ib. gage, 170° superheat, 28 in. vacuum. FIG. 19.—Load-water rate curve for 1,000 kw., Curtis turbo-generator.
efficient because of the low steam velocities which it handles. At the Inter-borough plant in New York the engine was of 7,500-kw. capacity, using saturated steam at 190 Ib. gage pressure, at the rate of 17.82 Ib. per kilowatt-hour. The addition of the low-pressure turbine reduced the rate to from 13 to 14 Ib. per